Author: Swain D.P.

Source: Sports Medicine, Volume 30, Number 1, 1 July 2000 , pp. 17-22(6)

Publisher: Adis International

Abstract:

Recent research has resulted in a number of recommended changes in how fitness professionals should prescribe target workloads and calculate the energy cost of exercise. The principal changes are in the use of oxygen consumption reserve (OR) as an alternative to percentage of maximal oxygen consumption (O) for prescribing exercise intensity, the use of net O rather than gross O for the calculation of caloric expenditure during exercise, and a modification of the American College of Sports Medicine (ACSM) equation for calculating the oxygen cost of leg cycle ergometry. The OR method of prescribing exercise workloads is similar to the heart rate reserve (HRR) method of prescribing target heart rates, i.e. the target workload is established at a given percentage of the difference between maximal and resting O. Several recent studies have shown that there is a discrepancy between the exercise intensity at given percentages of HRR and O, but that HRR and OR yield equivalent exercise intensities. The use of OR in exercise prescription provides more accurate target workloads, especially for individuals with a low fitness level. Net O during exercise is that amount above resting O due to the exercise itself. A recent recommendation is to employ net O in the calculation of the caloric expenditure during exercise, so as not to overestimate potential bodyweight loss. Several recent studies of leg cycling ergometry have yielded equations for the estimation of O that include a term for unloaded cycling, i.e. the oxygen cost of moving the legs against zero resistance. The equations from these studies provide more accurate estimations of cycling O than the existing ACSM equation, and a new standardised equation has been developed and adopted by the ACSM. The new equation is especially useful for improving the accuracy of O estimates during low intensity leg cycle ergometry. The ACSM equation for bench stepping has also been modified to include a term for resting metabolism.

Keywords: Energy expenditure; Exercise prescription

Document Type: Leading article

Affiliations: 1: Wellness Institute and Research Center, Old Dominion University, Norfolk, Virginia, USA

Publication date: 2000-07-01

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